What 'configuration' do I use for a Excel sheet in a column?

Back here in This Thread, I got a great tip on how to ensure that the Description property from my SW files was read from the correct configuration for display in the File List Column I'd created.  Now I have a new problem.

I use the same variable (Description) for other documents that are Excel spreadsheets.  The variable is mapped to custom properties in the Excel sheet and all works well, but since I changed the Description column to "Look for variable in given list of configurations" I've got nothing showing for a Description for my Excel docs.  I suppose that's because Excel sheets don't have configurations, and I don't know what "configuration" I should enter in the list so the a spreadsheet property will still be read...

I hope that's understandable...

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